Angular 4：无法绑定到'ngModel'

Question

我刚开始学习。我app.components.ts文件看起来像这样：

import { Component, NgModule } from '@angular/core'; 
import { FormsModule } from '@angular/forms'; 

@NgModule({ 
    imports: [FormsModule ], 
    //... 
}) 

@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    styleUrls: ['./app.component.css'] 
}) 
export class AppComponent { 
    // title = 'app'; 
    name = ''; 
} 

和我app.component.html是这样的：

<input type="text" [(ngModel)]="name"> 
    <p>{{ name }}</p> 

的Javascript控制台是给我以下错误：

compiler.es5.js:1689 Uncaught Error: Template parse errors: 
Can't bind to 'ngModel' since it isn't a known property of 'input'. ("et="_blank" href="http://angularjs.blogspot.ca/">Angular blog</a></h2> 
    </li> 
    <input type="text" [ERROR ->][(ngModel)]="name"> 
    <p>{{ name }}</p> 
</ul> 
"): ng:///AppModule/AppComponent.html@18:21 
    at syntaxError (http://localhost:4200/vendor.bundle.js:18052:34) 
    at TemplateParser.webpackJsonp.../../../compiler/@angular/compiler.es5.js.TemplateParser.parse (http://localhost:4200/vendor.bundle.js:29164:19) 
    at JitCompiler.webpackJsonp.../../../compiler/@angular/compiler.es5.js.JitCompiler._compileTemplate (http://localhost:4200/vendor.bundle.js:43209:39) 
    at http://localhost:4200/vendor.bundle.js:43129:62 
    at Set.forEach (native) 
    at JitCompiler.webpackJsonp.../../../compiler/@angular/compiler.es5.js.JitCompiler._compileComponents (http://localhost:4200/vendor.bundle.js:43129:19) 

...

This页面建议添加FormsModule但是你可以看到它不起作用。

Answer 1

你错过了班级AppModule？

import { Component, NgModule } from '@angular/core'; 
import { FormsModule } from '@angular/forms'; 

@NgModule({ 
    imports: [FormsModule ], 
    //... 
}) 
export class AppModule {} // <-- do you have this part? 

Answer 2

ngModel需要名称为输入：

<input type="text" [(ngModel)]="name" name="nome">